I have a yamata fy100 and the problem appears to be the cotton keeps breaking we have adjusted the tension from high to low and vice versa still with the same problem have taken off the protective cover to look and see if the problem can be seen, but the cotton seems to be too tight and keeps breaking at the needle

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First thing is to make sure there is no lint etc caught in the tension unit, even a small amount can reduce tension considerably.

If that doesn't solve the problem, we need you to give more detail of the machine, as there are a couple of different tension units which require different methods, 'over the top' or 'around a knob' ........which of these two is most like your machine ?

If you want any more help with this, post back to here, or just drop a line through the "Contact Us" page at www.bargainbox.com.au

If you have pattern dials set correctly then I might guess that one or more sets may have been missed when the thread was being set up in the machine. most of these models show either arrows or numbers for each or way the thread needs to be routed.

Coverstitch machines are very particular when it comes to thread. Use only MaxiLock cone thread. Do not use TruSew or SureLock thread. This can make the difference between working beautifully or not at all.

I have sneaking idea that it is your bobbin causing the problem. I have a Singer Stylist 7458 using a plastic 15j bobbin and the stitches were terrible until I changed to a metal bobbin, which Singer claims will scar the case, so I switched to a plastic class 15. I think you should call Singer at 1-800-4singer and complain that you are having nothing but problems with their "surefit" bobbin. I don't know what the 'surefit" is equivolent to, but Singer owes you an explanation. Sorry, I am so wordy but I am tired of these companies to save 3 cents give us junk and then act like it our fault if we try to remedy it. They told me to take for warranty, that the bobbin should have no problems, but my friend and sister in law has the same machine that I do and we all had the same problem. Does that mean 3 in a row are defective? The warranty center is over 100 miles away, and you know that they would not work on it right away and I would have to wait plus drive the extra 100 miles again. Or mail it, great service, right? I will use that bobbins that work and not listen to them because I will be bald pulling my hair out trying to use the bobbin that came with my machine. LOL Where did you buy your machine? Do they give lessons? Like JoAnn's? Go to a sewing center and see if they can hook you up with another bobbin that will work. Again sorry that I am so wordy, Good luck

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could be the cotton is too old ( cotton has an additive in it to stop it unraveling and this additive deteriorates with age and weakens the cotton--makes it rough and so it will not slide easily through the eye )
go up an needle eye size
check that the thread is not jamming rather than between he tension plates
check that you have the needle in correctly ( groove in the needle facing the thread )

The needle thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle8. try a different thread9. try adjusting the top thread tension--to a lesser number or letteruse your manual to guide you through tension adjusting

Symptoms like this are typically tension or threading problems. Grab some dental floss (unwaxed) completely remove the top thread. Lift the foot. Run your floss between any tension discs.

Get out your manual and make sure you thread it properly. Have the proper retention disc on the thread spindle if your machine has one. Make sure the thread is unspooling the correct way. Thread the machine with the foot up always. ...

the bobbin tension should never need to be adjusted! however, it MIGHT need it, but highly unlikely. check which of them needs changing by sewing a dark thread onto a light piece of material (or vice versa). this makes it easier to see what's happening. any thread which is looped through to the other side is too loose. if a thread is stretched very tightly it needs to be slackened. try to adjust the reel tension first as this is usually the problem.

The bobbin case rests on the lip of the hook and is is held into place by the position bracket. The position bracket is located at about 5 o'clock and has a small square end with a buffer spring. It must be positioned to hold the bobbin case securely and also allow the thread to pass through freely. It may be out of adjustment but may not.

If the bobbin case has turned, it is very likely to have suffered damage as it is made of a soft carbon fiber material. It not polished off, these damaged areas can snag the thread and jam the machine and create tension problems. Some gouges, burrs and needle punctures can be carefully sanded but you may need a new bobbin case. Use a 1500 grit sandpaper to smooth off the rough edges.